${^RE_TRIE_MAXBUF}
Controls how certain regex optimisations are applied an+d how
much memory they utilize. This value by default is 6553+6 which
corresponds to a 512kB temporary cache. Set this to a h+igher
value to trade memory for speed when matching large
alternations. Set it to a lower value if you want the
optimisations to be as conservative of memory as possib+le but
still occur, and set it to a negative value to prevent +the
optimisation and conserve the most memory. Under norma+l
situations this variable should be of no interest to yo+u.